“Cars release 30 percent of the carbon dioxide in the earth's air. Carbon dioxide is released from the tailpipe of a car and can do much damage to the human respiratory system. Every time an automobile burns a gallon of gasoline it releases 22 pounds of carbon dioxide.”
“Cars account for 76 percent of the carbon monoxide in the earth's air”
“Carbon monoxide affects the bloods total capacity for carrying oxygen by to the heart, brain, and other important organs.”
http://bicycling.suite101.com/article.cfm/cycling_and_the_environment
“Between 70 and 100 bicycles can be built with the resources required to build one car.”
http://www.sfbike.org/?environment
“Californians avoid producing seven tons of smog-forming gases per day by getting on bikes.”
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